Hi
For my 4 t scoots I use 10w40 warm months and 15w30 in the colder months
And I use Royal purple in all of my motorbikes be they 2t or 4 t
Take care and ride safely dear friend
Yours Hank

__________________"4wheels move the body 2 wheels move the soul"
Duty, Honor, Country. Those three hallowed words reverently dictate what you ought to be, what you can be, what you will be.
Douglas MacArthur

I use Castrol 10 40 motorcycle formula and just make sure it's changed on time. The benefit of synthetics is partly their longevity. I can't leave the oil in there that long it messes with my mind so I would pay more and receive no benefit. My oil generally still looks ok at oil changes so I'll stick with it.

__________________

Do not fear mistakes. You will know failure. Continue to reach out.- Benjamin Franklin

30 weight oils have had to eliminate much of the protective qualities oils had due to emissions and cat converters. This is why most people run 1040 or 1540 since they still have the good stuff. 15w40 has the best protective packages.

I use Castrol 10 40 motorcycle formula and just make sure it's changed on time. The benefit of synthetics is partly their longevity. I can't leave the oil in there that long it messes with my mind so I would pay more and receive no benefit. My oil generally still looks ok at oil changes so I'll stick with it.

I have to agree with Scootwin about leaving it in there, and messing with the mind.... So I use conventional oil, besides, in the 50 years that I've owned/driven/riden, everything from scooters, to MC's, to ag tractors, to cars and pickups, to tractor-trailers, I've never experienced a lubrication related failure..."If it ain't broke..don't fix it"

I vote for Mobil Delvac 15w/40. Have run it millions and millions of miles, on road, and thousands and thousands of hours, off road.. Just my $.02

Mobil 1 Synthetic. 10-30 because it was on sale and I got a bunch of it. Works well enough for my Reflex. But if the 10-40 or 15-40 Mobil 1 synthetic was on sale, I would have bought a 12 case of that instead......just because. Having said that though, unless the ambient temperatures are very hot or very cold, the 10-30 is sufficient for my application since that is what the service manual calls for anyway.

__________________Southeast Michigan Dark Side Rider
4 Honda Reflex scooters & a FSC600A Silverwing
Originator of the "Darkside" Honda Reflex.
"Yeah dude, that IS a car tire there on the back of my scooter."
Sometimes I'm so far outside of the box, the Hubble telescope can't find me